It looks like Anki cards. I also value spaced repetition to help me store valuable facts in my long term memory. I personally use my Todoist for that (Project

It looks like Anki cards. I also value spaced repetition to help me store valuable facts in my long term memory. I personally use my Todoist for that (Project called "Anki" where every todo is a question and the answer is in the comments. And I can manage intervals by using the task scheduling feature to have them appear later (depending on the ease to remind the answer). But I like the simplicity of your app and the logo is kinda cool also. +1 for the command line interface. Good idea.